Thread (87 messages) 87 messages, 9 authors, 2024-01-24

Re: [PATCH 19/21] gpio: swnode: replace gpiochip_find() with gpio_device_find_by_label()

From: Paul Cercueil <paul@crapouillou.net>
Date: 2024-01-24 14:59:32
Also in: linux-acpi, linux-gpio, linux-omap, linux-tegra, lkml, platform-driver-x86

Hi Bartosz,

Le mardi 05 septembre 2023 à 20:53 +0200, Bartosz Golaszewski a écrit :
quoted hunk ↗ jump to hunk
From: Bartosz Golaszewski <redacted>

We're porting all users of gpiochip_find() to using
gpio_device_find().
Update the swnode GPIO code.

Signed-off-by: Bartosz Golaszewski <redacted>
---
 drivers/gpio/gpiolib-swnode.c | 29 ++++++++++++-----------------
 1 file changed, 12 insertions(+), 17 deletions(-)
diff --git a/drivers/gpio/gpiolib-swnode.c b/drivers/gpio/gpiolib-
swnode.c
index b5a6eaf3729b..56c8519be538 100644
--- a/drivers/gpio/gpiolib-swnode.c
+++ b/drivers/gpio/gpiolib-swnode.c
@@ -31,31 +31,26 @@ static void swnode_format_propname(const char
*con_id, char *propname,
 		strscpy(propname, "gpios", max_size);
 }
 
-static int swnode_gpiochip_match_name(struct gpio_chip *chip, void
*data)
+static struct gpio_device *swnode_get_gpio_device(struct
fwnode_handle *fwnode)
 {
-	return !strcmp(chip->label, data);
-}
+	const struct software_node *gdev_node;
+	struct gpio_device *gdev;
 
-static struct gpio_chip *swnode_get_chip(struct fwnode_handle
*fwnode)
-{
-	const struct software_node *chip_node;
-	struct gpio_chip *chip;
-
-	chip_node = to_software_node(fwnode);
-	if (!chip_node || !chip_node->name)
+	gdev_node = to_software_node(fwnode);
+	if (!gdev_node || !gdev_node->name)
 		return ERR_PTR(-EINVAL);
 
-	chip = gpiochip_find((void *)chip_node->name,
swnode_gpiochip_match_name);
-	return chip ?: ERR_PTR(-EPROBE_DEFER);
+	gdev = gpio_device_find_by_label((void *)gdev_node->name);
+	return gdev ?: ERR_PTR(-EPROBE_DEFER);
 }
 
 struct gpio_desc *swnode_find_gpio(struct fwnode_handle *fwnode,
 				   const char *con_id, unsigned int
idx,
 				   unsigned long *flags)
 {
+	struct gpio_device *gdev __free(gpio_device_put) = NULL;
 	const struct software_node *swnode;
 	struct fwnode_reference_args args;
-	struct gpio_chip *chip;
 	struct gpio_desc *desc;
 	char propname[32]; /* 32 is max size of property name */
 	int error;
@@ -77,12 +72,12 @@ struct gpio_desc *swnode_find_gpio(struct
fwnode_handle *fwnode,
 		return ERR_PTR(error);
 	}
 
-	chip = swnode_get_chip(args.fwnode);
+	gdev = swnode_get_gpio_device(args.fwnode);
 	fwnode_handle_put(args.fwnode);
-	if (IS_ERR(chip))
-		return ERR_CAST(chip);
+	if (IS_ERR(gdev))
+		return ERR_CAST(gdev);
I'm a bit late to the party, sorry.

I'm looking at how __free() should be used to use it in my own
patchset, and I was wondering if this code actually works.

What happens if swnode_get_gpio_device() returns an error pointer?
Won't that cause a call to gpio_device_put() with the invalid pointer?

Cheers,
-Paul
 
-	desc = gpiochip_get_desc(chip, args.args[0]);
+	desc = gpiochip_get_desc(gdev->chip, args.args[0]);
 	*flags = args.args[1]; /* We expect native GPIO flags */
 
 	pr_debug("%s: parsed '%s' property of node '%pfwP[%d]' -
status (%d)\n",

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